Query:
pick

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{pdb_id} pick

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{labl_chain_id} ({auth_chain_id})

Target:
pick

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{pdb_id} pick

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{labl_chain_id} ({auth_chain_id})

Input the PDB ids of the two structures you want to compare. You can click on the "pick" labels to select from a list of available entries. Optionally, you can select an specific chain, or leave the chain box empty to use the whole IAU.